Log message:
Revbump packages with a runtime Python dep but no version prefix.

For the Python 3.8 default switch.

Log message:
*: Recursive revbump from textproc/icu-68.1

Log message:
math/blas, math/lapack: Install interchangeable BLAS system

Install the new interchangeable BLAS system created by Thomas Orgis,
currently supporting Netlib BLAS/LAPACK, OpenBLAS, cblas, lapacke, and
Apple's Accelerate.framework.  This system allows the user to select any
BLAS implementation without modifying packages or using package options, by
setting PKGSRC_BLAS_TYPES in mk.conf. See mk/blas.buildlink3.mk for details.

This commit should not alter behavior of existing packages as the system
defaults to Netlib BLAS/LAPACK, which until now has been the only supported
implementation.

Details:

Add new mk/blas.buildlink3.mk for inclusion in dependent packages
Install compatible Netlib math/blas and math/lapack packages
Update math/blas and math/lapack MAINTAINER approved by adam@
OpenBLAS, cblas, and lapacke will follow in separate commits
Update direct dependents to use mk/blas.buildlink3.mk
Perform recursive revbump

Log message:
graphics/blender-lts: import blender-2.83.5

Blender is the free and open source 3D creation suite.

It supports the entirety of the 3D pipeline - modeling, rigging, animation,
simulation, rendering, compositing and motion tracking, video editing and
2D animation pipeline.

This package provides Long Term Support (LTS) version.